4217 Engelhardt

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4217 Engelhardt is a main-belt asteroid, discovered on January 24, 1988 by Carolyn S. Shoemaker at Palomar Observatory.[1] Its provisional designation was 1988 BO2. It is named after the Baltic German geologist and mineralogist Wolf von Engelhardt (1910–2008). The asteroid is estimated to be about 9 km (5.6 mi) in diameter.[1]

Engelhardt will pass about 0.0017 AU (250,000 km; 160,000 mi) from Earth threatening asteroid (29075) 1950 DA in 2736.[2]


  1. ^ a b "JPL Small-Body Database Browser: 4217 Engelhardt (1988 BO2)" (2013-07-05 last obs). Jet Propulsion Laboratory. Retrieved 2013-10-11. 
  2. ^ Giorgini, J. D.; Ostro, S. J; Benner, L. A. M.; Chodas, P.W.; Chesley, S.R.; Hudson, R. S.; Nolan, M. C.; Klemola, A. R.; Standish, E. M.; Jurgens, R. F.; Rose, R.; Chamberlin, A. B.; Yeomans, D. K.; Margot, J.-L. (2002). "Asteroid 1950 DA's Encounter With Earth in 2880: Physical Limits of Collision Probability Prediction" (PDF). Science 296 (5565): 132–136. Bibcode:2002Sci...296..132G. doi:10.1126/science.1068191. PMID 11935024. 

Warner, Brian (2006). "4217_Engelhardt". The Minor Planet Observer. Palmer Divide Observatory. Archived from the original on 6 May 2006. Retrieved 2006-03-30.